What Affects the Sealing Performance of Insulating Glass? SuperVIG® Explains the Differences Among Three Secondary Sealant Types

Dual‑seal structure and proper secondary sealant selection are critical to avoid insulating glass fogging, argon leakage and performance degradation for windows, doors and curtain‑wall projects.

This article illustrates the dual‑seal principle of SuperVIG® insulating glass: butyl primary seal serves as gas‑moisture barrier while secondary seal delivers bonding and edge‑structure stability. It compares three mainstream secondary sealants — polysulfide, polyurethane and silicone — covering argon permeability, moisture‑vapor transmission, weathering, UV resistance, structural bonding and applicable scenarios. Secondary sealant material directly governs gas‑holding ability, anti‑fogging performance and long‑term service reliability of insulating glass. Relevant code requirements for different curtain‑wall types are referenced. Project evaluators shall check sealing‑system compliance besides glass thickness and cost. SuperVIG® supplies tailor‑made dual‑seal insulating glass solutions focusing on long‑term sealing reliability for building energy‑saving applications.